McCain doubles down on calls for select committee to investigate Russia's involvement in election

Sen. John McCainJohn Sidney McCainGOP strategist donates to Alabama Democrat Meghan McCain knocks Bannon: 'Who the hell are you' to criticize Romney? Dems demand Tillerson end State hiring freeze, consult with Congress MORE on Sunday doubled down on his call for a select committee to investigate Russia's role in the presidential election while dismissing comments from Donald TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE about the matter. 

"We need to get to the bottom of this. We need to find out what was done," the Arizona Republican said on CNN's "State of the Union."

"There's no doubt they were interfering, and no doubt there was a cyber attack." 

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Both the FBI and CIA have concluded that Russia interfered with the elections to help Trump win. 

But Trump has dismissed the allegations, saying there is no proof that Russia hacked into the email accounts of Democratic National Committee and Clinton campaign staffers. 

McCain said while he hasn't heard Trump criticize Russian President Vladimir Putin, he suspects that "reality is going to intercede at one point or another." 

McCain instead focused his criticisms on President Obama, saying the U.S. has been "totally paralyzed" in responding to Russia's attacks. 

"The fact is that they're hacking every single day in other areas of our military and other aspects of American life, and we have no strategy, nor do we have any policy toward that," he said. 

"This is serious business," McCain said. 

"If they're able to do harm to the electoral process, then they can destroy democracy."